/**
 * L2FProd.com Common Components 6.9.1 License.
 *
 * Copyright 2005-2011 L2FProd.com
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.l2fprod.common.util;

/**
 * Deals with the different version of the Java Virtual Machine. <br>
 */
public class JVM {

    public final static int JDK1_0 = 10;
    public final static int JDK1_1 = 11;
    public final static int JDK1_2 = 12;
    public final static int JDK1_3 = 13;
    public final static int JDK1_4 = 14;
    public final static int JDK1_5 = 15;
    public final static int JDK1_6 = 16;

    private static JVM current;
    static {
        current = new JVM();
    }

    /**
     * @return the current JVM object
     */
    public static JVM current() {
        return current;
    }

    private int jdkVersion;

    /**
     * Creates a new JVM data from the <code>java.version</code>
     * System property
     *  
     */
    public JVM() {
        this(System.getProperty("java.version"));
    }

    /**
     * Constructor for the OS object
     */
    public JVM(String p_JavaVersion) {
        if (p_JavaVersion.startsWith("1.6.")) {
            jdkVersion = JDK1_6;
        } else if (p_JavaVersion.startsWith("1.5.")) {
            jdkVersion = JDK1_5;
        } else if (p_JavaVersion.startsWith("1.4.")) {
            jdkVersion = JDK1_4;
        } else if (p_JavaVersion.startsWith("1.3.")) {
            jdkVersion = JDK1_3;
        } else if (p_JavaVersion.startsWith("1.2.")) {
            jdkVersion = JDK1_2;
        } else if (p_JavaVersion.startsWith("1.1.")) {
            jdkVersion = JDK1_1;
        } else if (p_JavaVersion.startsWith("1.0.")) {
            jdkVersion = JDK1_0;
        } else {
            // unknown version, assume 1.3
            jdkVersion = JDK1_3;
        }
    }

    public boolean isOrLater(int p_Version) {
        return jdkVersion >= p_Version;
    }

    public boolean isOneDotOne() {
        return jdkVersion == JDK1_1;
    }

    public boolean isOneDotTwo() {
        return jdkVersion == JDK1_2;
    }

    public boolean isOneDotThree() {
        return jdkVersion == JDK1_3;
    }

    public boolean isOneDotFour() {
        return jdkVersion == JDK1_4;
    }

    public boolean isOneDotFive() {
        return jdkVersion == JDK1_5;
    }

    public boolean isOneDotSix() {
        return jdkVersion == JDK1_6;
    }

}